U.S. Border Patrol agents said 33 cans of marijuana were spotted Friday in what they believe was a creative ways to smuggle their Mexican pot in the country by shooting them off a cannon.

Authorities said the cans were discovered in a field near where the Colorado River crosses the U.S.-Mexico border. They believe the cans were launched about 500 feet into the U.S. using a pneumatic-powered cannon.

After searching the area, agents recovered a carbon dioxide tank.

Authorities said Border Patrol agents in the Yuma sector near the Arizona-California border are adapting and shifting resources as smugglers come up with new ways of transporting their contraband.